Add first-launch onboarding message

[forketyfork]

Display a brief welcome message in grey text on first launch, explaining:

• Cmd+N/W for terminal management
• Cmd+Enter for focus toggle
• Hold Escape to interrupt agents
• architect hook command for AI agent integration

The message is shown once and tracked via onboarding_shown in persistence.toml.

https://claude.ai/code/session_013AMHvCsisuoq8T8BroZKs4

[Copilot]

Pull request overview

This PR adds a first-launch onboarding message that displays keyboard shortcuts and AI agent integration instructions to new users. The message appears in grey text on first launch and is tracked via a persistence flag.

Changes:

• Added onboarding_shown boolean flag to persistence configuration
• Implemented first-launch detection and welcome message display in runtime
• Updated documentation to reflect the new persistence field

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/config.zig	Added onboarding_shown field to persistence structures and serialization logic
src/app/runtime.zig	Implemented onboarding message display logic with ANSI color codes
docs/configuration.md	Documented the new onboarding_shown persistence field

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[Copilot]

The error handling uses a catch block with a warning log, but then continues to set onboarding_shown = true even if the message failed to display. This means users who encounter this error will never see the onboarding message. Consider only setting the flag to true if the message is successfully displayed, or handle the error differently.

Suggested change

	stream.nextSlice(onboarding_msg) catch |err| {
	log.warn("Failed to display onboarding message: {}", .{err});
	};
	sessions[0].markDirty();
	}
	persistence.onboarding_shown = true;
	persistence.save(allocator) catch |err| {
	log.warn("Failed to save persistence after onboarding: {}", .{err});
	};
	if (stream.nextSlice(onboarding_msg)) |_| {
	sessions[0].markDirty();
	persistence.onboarding_shown = true;
	persistence.save(allocator) catch |err| {
	log.warn("Failed to save persistence after onboarding: {}", .{err});
	};
	} else |err| {
	log.warn("Failed to display onboarding message: {}", .{err});
	}
	}